Human heart function The heart circulates blood through two pathways: the pulmonary circuit and the systemic circuit. In the pulmonary circuit, deoxygenated blood leaves the right ventricle of the heart via the pulmonary artery and travels to the lungs, then returns as oxygenated blood to the left atrium of the heart via the pulmonary vein. In the systemic circuit, oxygenated blood leaves the body via the left ventricle to the aorta, and from there enters the arteries and capillaries where it supplies the body's tissues with oxygen. Deoxygenated blood returns via veins to the venae cavae, re-entering the heart's right atrium. Of course, the heart is also a muscle, so it needs a fresh supply of oxygen and nutrients, too, Phillips said. After the blood leaves the heart through the aortic valve, two sets of arteries bring oxygenated blood to feed the heart muscle," he said. The left main coronary artery, on one side of the aorta, branches into the left anterior descending artery and the left circumflex artery. The right coronary artery branches out on the right side of the aorta. Blockage of any of these arteries can cause a heart attack, or damage to the muscle of the heart, Phillips said. A heart attack is distinct from cardiac arrest, which is a sudden loss of heart function that usually occurs as a result of electrical disturbances of the heart rhythm. A heart attack can lead to cardiac arrest, but the latter can also be caused by other problems, he said.The heart contains electrical "pacemaker" cells, which cause it to contract — producing a heartbeat. "Each cell has the ability to be the 'band leader' and [to] have everyone follow," Phillips said. In people with an irregular heartbeat, or atrial fibrillation, every cell tries to be the band leader, he said, which causes them to beat out of sync with one another. A healthy heart contraction happens in five stages. In the first stage (early diastole), the heart is relaxed. Then the atrium contracts (atrial systole) to push blood into the ventricle. Next, the ventricles start contracting without changing volume. Then the ventricles continue contracting while empty. Finally, the ventricles stop contracting and relax. Then the cycle repeats. Valves prevent backflow, keeping the blood flowing in one direction through the heart.

The heart is an organ that pumps blood throughout the body. It comprises four chambers. 1. Atria 2. Ventricles The walls of the heart is made up of three layers. 1. Epicardium 2. Myocardium 3.Endocardium

Heart pumps blood to whole body. It has 4 chambers 2 atrium and two ventricles.

Dichloro Diphenyl Trechloroethane

Penetration and shielding are two underlying principles in determining the physical and chemical properties of elements.
Penetration describes the proximity of electrons in an orbital to the nucleus. Electrons which experience greater penetration experience less shielding and therefore experience a larger Effective Nuclear Charge (Z_eff) but shield other electrons more effectively.  Electrons in different orbitals have different wavefunctions and therefore different distributions around the nucleus.

• Amoeba is a single celled organims that reproduces new individual of its type by dividing its nucleus into two nuclei.
• after division of the nucleus the body of amoeba divides into two parts with each individual part receiving a nucleus.
• The two separate bodies of amoeba develops into new individuals.
• This method of reproducing new individual by dividing into two individual is called binary fission.

The gravitational force is a force that attracts any two objects with mass

Gravity is a force which tries to pull two objects toward each other

The ancient greek thinker, Theophrastus is known as father of botany.

His two large botanical works,

1. On the history of plants
2. On the causes of plants.

The father of Modern Biology is Carlous Linneaus. And he is also known as father os taxonomical biology which is modern biology.

Arstu

Immunization is a term that refers to the process of getting vaccinated. It helps in the prevention of diseases as the body gets immune to the disease after getting vaccinated. To eradicate a disease completely, the whole population of the place has to be immunized

What is the meaning of solid state

Effects of force, :-
a) Force can set a stationary object in motion...
b) Force can stop the moving objects or slow then down....
c) Force can change the direction of the object..
d) Force can change the shape of an object..

Hmm

Vaccination is a process in which vaccine is given to improve the immunity of the body against a specific disease. Vaccine is a biological preparation that resembles a disease causing microbe. These vaccines are made up of dead or very weak microbes.

It has property of malebility

Iron, because it is a metal

force of gravity

The process of converting free nitrogen gas of the atmosphere into nitrogen compounds is called nitrogen fixation (may this answer help you )

Nitrogen fixation is the essential biological process and the initial stage of the nitrogen cycle. In this process, nitrogen in the atmosphere is converted into ammonia (another form of nitrogen) by certain bacterial species like Rhizobium, Azotobacter, etc. and by other natural phenomena.

Plants are the main of the sources of food. The nutrients obtained from plants are synthesized by plants using various elements which they obtain from the atmosphere as well as from the soil. This group of elements includes nitrogen as well. Plants obtain nitrogen from the soil through the process of protein synthesis. Unlike carbon dioxide and oxygen, atmospheric nitrogen cannot be obtained through stomata of leaves. Because the concentration of nitrogen gas present in the atmosphere can not be directly used by plants and also the concentration of the usable form of nitrogen in the atmosphere is very less. There are certain bacteria and some natural phenomenon which help in Nitrogen fixation.

Jupiter is the largest planet in the solar system. Fittingly, it was named after the king of the gods in Roman mythology. In a similar manner, the ancient Greeks named the planet after Zeus, the king of the Greek pantheon. The planet Jupiter now has a total of 79 identified moons. More than 400 years after Galileo Galilei discovered the first of Jupiter's moons, astronomers have found a dozen more — including one they've dubbed "oddball" — orbiting the planet. That brings the total number of Jovian moons to 79.

By using the energy of sunlight, plants can convert carbon dioxide and water into carbohydrates and oxygen in a process called photosynthesis. As photosynthesis requires sunlight, this process only happens during the day. The green leaves of plants carry out both photosynthesis (in light) and respiration (all the time). Photosynthesis uses carbon dioxide to make sugar and produces oxygen as a byproduct. Respiration uses oxygen to release energy from stored sugar and produces carbon dioxide as a byproduct. All plants produce oxygen from the breakdown of water thanks to chlorophyll. The remaining protons and electrons are used for the production of sugars. These sugars are then converted into whatever the plant needs.

Maize,paddy

The crops which are shown in the rainy season are called kharif crops ( The rainy season in india is generally from june to september ) .Example of kharif crops paddy, maize, soyabean, groundnut,cotton etc. (may this answer help you)

Paddy maize groundnut . By padmini

The crops which are sown in rainy season are called kharif crops. The growing of kharif crops starts in June-July at the beginning of south-west monsoon because these crops need substantial amount of water. Examples of kharif crops are paddy, maize, millet, soyabean, groundnut and cotton. Such crops are also called summer crops. Kharif crops, monsoon crops or autumn crops are domesticated plants like rice that are cultivated and harvested in India, Bangladesh during the Indian subcontinent's monsoon season, which lasts from June to November depending on the area. ... Rice,maize, sorghum and cotton are the major kharif crops in India.

The kharif crops include rice, maize,sorghum, pearl millet/bajra, finger millet/ragi (cereals), arhar (pulses),soyabean, groundnut (oilseeds), cottonetc. The rabi crops include wheat,barley, oats (cereals),chick pea, lentil (pulses), linseed, mustard (oilseeds). Kharif crops, monsoon crops or autumn crops are domesticated plants like rice that are cultivated and harvested in India, Bangladesh during the Indian subcontinent's monsoon season, which lasts from June to November depending on the area. ... Rice,maize, sorghum and cotton are the major kharif crops in India.a

Candles produce light by releasing heat. A candle flame consists of three zones. Each zone has different temperatures and colors.

 

• The first zone is called the Outer zone
• The second zone is called the Middle zone
• The third zone is called the Inner zone

The outer zone is blue in color, due to complete combustion,. This zone is the hottest zone.

The middle one is in yellow color, which is the bright part of the flame. It is moderately hot and partial combustion of fuel takes place.

The least hot region of the flame is the innermost zone. This inner zone is black in color due to the presence of unburnt wax vapors.

Plough, cultivator,hoe

Plough,Hoe,Cultivator

When classified by chemical structure, there are two generally recognized classes of plastic materials: Thermosets, having cross-linked molecular chains, and Thermoplastics, which are made up of linear molecular chains. Thermoset polymers require a two-stage polymerization process.  A term for thermoplastic optical materials; that is, those in which the polymer chains remain linear after heating and molding and which thus can be remolded again and again, unlike thermoset plastics, which cannot be remolded.

Two types of plastic :- 1. Thermoplastic 2. Thermosetting plastic

There are two types of plastic : 1. Thermoplastic. 2. Thermosetting .

Depending on physical properties, plastics are divided into two types: Thermoplastic and thermosetting.

1. Thermoplastic: Plastics that can be deformed easily upon heating and can be bent easily. Linear polymers and a combination of linear and cross-linked polymers come under thermoplastics. Example: PVC, nylon, polythene, etc.
2. Thermosetting: Plastics that cannot be softened again by heating once they are molded. Heavily cross-linked polymers come under the category of thermosetting plastics. Example: Bakelite, melamine, etc. Bakelite is used for making electrical switches whereas melamine is used for floor tiles.

Scientists have spotted 20 small moons orbiting Saturn, pipping Jupiter as the planet with the most moons in the solar system — but there may be more moons that are yet to be discovered.

An anaerobic process through which sugar/carbohydrates are converted into alcohol/acids and carbon dioxide, is known as fermentation.

It is useful in food and beverage industries because microorganisms like yeast when added in food items make the food fluffy and increases the volume.

In beverages industry the sugar of fruit juices are converted into alcohol and acids.

The dicot stem is characterised by the presence of conjoint, collateral, and open vascular bundles, with a strip of cambium between the xylem and phloem. The vascular bundles are arranged in the form of a ring, around the centrally-located pith. The ground tissue is differentiated into the collenchyma, parenchyma, endodermis, pericycle, and pith. Medullary rays are present between the vascular bundles.
A pericycle is a cylindrical shaped region of primary tissue of root or stem that consists of parenchyma or sclerenchyma cells. It lies just inside the endodermis and forms outermost part of the stele of plants. 

To supply water to the crop plants at regular intervals other than source of rain etc is called Irrigation. Irrigation provides nutrients to the plants and also help in it's development

Irrigation is the process of applying water to the crops artificially to fulfil their water requirements. Nutrients may also be applied to the crops through irrigation. The various sources of water for irrigation are wells, ponds, lakes, canals, tube-wells, and even dams. Irrigation offers moisture required for growth and development, germination, and other related functions.

Push or pull of an object is considered a force. Push and pull come from the objects interacting with one another. Terms like stretch and squeeze can also be used to denote force.
Force is an external agent capable of changing the state of rest or motion of a particular body. It has a magnitude and a direction. The direction towards which the force is applied is known as the direction of the force, and the application of force is the point where force is applied.

Metals react with acids to produce hydrogen gas. If a matchstick is brought near the mouth of the tube containing the product of the reaction then we hear a pop sound. It is this hydrogen gas that burns with a pop sound.

• For instance, Magnesium reacts with dilute hydrochloric acid to form magnesium chloride and hydrogen.
  Mg + 2HCl → MgCl₂ + H₂

Reactions of metal with bases

Metals react with sodium hydroxide to produce hydrogen gas.

For instance, zinc reacts with sodium hydroxide to give sodium zincate.

Zn + 2NaOH → Na₂ZnO₂  + H₂

 

The 4R principle is (1)Reduce means the little use of things which are harmful for us like plastics it is known as 1R (2)Reuse means the use of waste meterial like juice can as pen/pen stand it is known as 3R (3)Recycle means the things got recycle like Papers and (4) Recover mean the things got recover like battery it is known as 4R. These are principle of 4R

Chlorination is a commonly used chemical method for purifying water.

It is done by adding chlorine tablets or bleaching powder to the water.

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